Textbook Question
Starting with a Fischer projection of d-glucose (and other sugars), switch only the stereocenter that gave it the designation of d. What new sugar have you made? [Hint: The answer is not l-glucose.]
Ch. 27 - Carbohydrates, Nucleic Acids, and Lipids
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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Table of contents
- Ch. 2 - General Chemistry Translated: Finding the Electrons114
- Ch. 3 - Alkanes and Cycloalkanes: Properties and Conformational Analysis109
- Ch. 4 - Acids and Bases: Electron Flow144
- Ch. 5 - Chemical Reaction Analysis: Thermodynamics and Kinetics118
- Ch. 6 - Stereoisomerism: Arrangement of Atoms in Space112
- Ch. 7 - Principles of Green (Organic) Chemistry3
- Ch. 8 - Alkenes I: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes II: Oxidation and Reduction150
- Ch. 10 - Alkynes: Electrophilic Addition and Redox Reactions101
- Ch. 11 - Properties and Synthesis of Alkyl Halides: Radical Reactions108
- Ch. 12 - Substitution and Elimination: Reactions of Haloalkanes172
- Ch. 13 - Alcohols, Ethers and Related Compounds: Substitution and Elimination239
- Ch. 14 - Structural Identification I: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification II: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution I: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution II: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems I: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems II: Pericyclic Reactions54
- Ch. 23 - Benzene I: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene II: Reactions Influenced by the Aromatic Ring62
- Ch. 25 - Amines: Structure, Reactions, and Synthesis27
- Ch. 26 - Amino Acids, Proteins, and Peptide Synthesis9
- Ch. 27 - Carbohydrates, Nucleic Acids, and Lipids54
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471Not the one you use?Change textbook
Chapter 26, Problem 65
Suggest a mechanism by which TXB2 might be formed from TXA2 in an acid-catalyzed hydrolysis reaction. [The structure has been simplified.]
Verified step by step guidance1
Identify the starting material TXA₂, which contains an epoxide functional group. This is characterized by a three-membered cyclic ether, which is highly strained and reactive.
Recognize that the reaction involves acid-catalyzed hydrolysis. The acid will protonate the epoxide oxygen, increasing the electrophilicity of the epoxide carbon atoms.
Once protonated, the epoxide ring is more susceptible to nucleophilic attack. Water, acting as a nucleophile, will attack one of the electrophilic carbon atoms of the epoxide, leading to ring opening.
The ring opening results in the formation of a diol, where two hydroxyl groups are added to the carbons that were originally part of the epoxide. This is evident in the product structure TXB₂.
The functional group formed in TXB₂ is a vicinal diol, characterized by two hydroxyl groups on adjacent carbon atoms. This transformation is typical of epoxide hydrolysis reactions.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Acid-Catalyzed Hydrolysis
Acid-catalyzed hydrolysis is a chemical reaction where water is used to break down a compound in the presence of an acid. The acid donates protons (H⁺) to facilitate the reaction, often enhancing the electrophilicity of the substrate. This process is crucial in organic chemistry for converting esters, amides, and other functional groups into their corresponding acids or alcohols.
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Acid Catalyzed
Mechanism of Reaction
The mechanism of a reaction describes the step-by-step sequence of elementary reactions by which overall chemical change occurs. Understanding the mechanism is essential for predicting the products and intermediates formed during the reaction. In the case of TXB₂ formation from TXA₂, identifying the key intermediates and transition states will clarify how the transformation occurs under acidic conditions.
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Structural Changes in Organic Compounds
Structural changes in organic compounds refer to the alterations in the arrangement of atoms within a molecule during a chemical reaction. These changes can involve bond breaking and forming, leading to the creation of new functional groups or isomers. Recognizing how TXA₂ can be converted to TXB₂ involves understanding these structural transformations and the stability of intermediates formed during the reaction.
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Related Practice
Textbook Question
Identify the isoprene units in the terpenes shown. In cross-linked or ring-containing terpenes, linkages can be formed between more than just C1 and C4 of isoprene.
(b)
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Textbook Question
The α- and β-anomers of glucose are shown here. In solution, these two epimers can interconvert through a process called mutarotation.
Given that α-D-glucose has a specific rotation of + 112.2° , why is the specific rotation of β-D-glucose not -112.2°? What molecule would have a specific rotation of -112.2°?
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Textbook Question
Upon dissolving α-D-glucose or β-D-glucose in water, the specific rotation gradually changes, eventually reaching +52.6° for both solutions. Explain what is happening here.
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Textbook Question
Identify the isoprene units in the terpenes shown. In cross-linked or ring-containing terpenes, linkages can be formed between more than just C1 and C4 of isoprene.
(e)
2
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Textbook Question
Identify the isoprene units in the terpenes shown. In cross-linked or ring-containing terpenes, linkages can be formed between more than just C1 and C4 of isoprene.
(c)
2
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